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A block of mass `1kg `is placed on a rough horizontal surface. A spring is attached to the block whose other end is joined to a rigid wall, as shown in the figure. A horizontal force is applied on the block so that it remains at rest while the spring is elongated by `x(xge(mumg)/(k))`. Let `F_(max)` and `F_(mi n)` be the maximum and minimum values of force `F` for which the block remains in equilibrium. For a particular `x, F_(max)-F_(mi n)=2N`. Also shown is the variation of `F_(max)+F_(mi n)` versus `x`, the elongation of the spring. The spring constant of the spring is `:`A. `25N//m`B. `20N//m`C. `2.5N//m`D. `50N//m` |
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Answer» Correct Answer - A `F_(max)+F_(min)=2kx ....(1)` from graph `F_(max)+F_(min)=5` and `x=0.1` Putting in equation `(1)` `t=2k(0.1)` `k=25N//m`. |
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